Product Version = NetBeans IDE 8.2 (Build 201609300101)
Operating System = Windows 7 version 6.1 running on amd64
Java; VM; Vendor = 1.8.0_121
Runtime = Java HotSpot(TM) 64-Bit Server VM 25.121-b13

Reproducibility: Happens sometimes, but not always

STEPS:
  * Open dialog Foo
  * Click on button "Click me"

ACTUAL:
  nothing happens

EXPECTED:
  message pops up

Hi,
the above given problems has been repeatedly occurring at my project. The problem has started about 3 weeks ago.

I work on Java  Windows based project and from time to time this problem occurres on debugging. The following scenarios occurr:
Debugger points to empty lines, tracking a procedure finish prior to reaching the last statement, or on starting the debugging (CTRL+F5) the breakpoint moves to the other line.

This problems occurs irregularilly but often  after some changes to a class source code are made. 
I start clearing amd building all projects accordingly but this doesn't help very much. It looks llike some NB files are not updated properly on rebuilding the projects.
What allways helps is creating the new class with the different name and putting the class code into this new class, removing the "old"class and manual correction of all class  references.
But after some time this problem repeats.

I tried to decompile such problem class to check if the statement line numbers in my source code class match the statement line numbers in the decompiled class source and they do.

I use the NB default compiling options. 

Thanks
Milan